Transaction in Own Shares

Spirent Communications PLC
02 January 2008


Spirent Communications PLC (the "Company") announces that it has put in place an
irrevocable, non-discretionary programme for the repurchase of its Ordinary
shares during the close period which precedes the Company's 2008 Final Results
announcement expected to be made on 28 February 2008.

The share buy-back programme will be managed by Hoare Govett Limited, which
makes its trading decisions in relation to the Company's securities
independently of, and uninfluenced by, the Company. Any repurchases pursuant to
these arrangements will be effected during the period between 1 January 2008 and
27 February 2008 within certain pre-set parameters and in accordance with both
the Listing Rules and the limitations of the repurchase authority granted to the
Directors at the last Annual General Meeting of shareholders.

The shares repurchased under the programme will be held in treasury.



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